Camas Meadows Lodge
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Camas Meadows Lodge clear sky chart from 2005-11-06 to 2024-06-17.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.

Observation Type	Minimum conditions for hour to be usable				Out of hours
	Clear of Clouds	Transparency	Seeing	Sky Brightness
Planetary:	50%	(no limit)	Average	(no limit)	Nighttime Hours
Deep Sky:	70%	Average	(no limit)	5.9	Nighttime Hours
CCD Imaging:	70%	Below Average	Poor	(no limit)	Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

By Month

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

		Occurrence of each Forecast	Data Points
Cloud Cover	Day	4 8% 3 7% 5% 5% 5% 4 7% 8% 44%	89390
	Night	4 8% 3 7% 5% 5% 5% 5% 7% 8% 43%	89525
Transparency	Day	34% 9% 14% 23% 16% 4	89117
	Night	36% 9% 16% 23% 13% 3	89378
Seeing	Day	10% 17% 31% 28% 12% 3	13814
	Night	8% 10% 30% 34% 16% 2	22868

By Month

Percentage Cloud Cover NW (2006-)
Color Meanings: Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	4 15% 6% 14% 7% 7% 7% 5% 7% 8% 20%	2539
	11th to 20th	Day	4 15% 7% 14% 5% 5% 4 4 6% 7% 28%	2516
	21st to end	Day	7% 20% 5% 11% 6% 5% 6% 5% 7% 7% 20%	2794
February	1st to 10th	Day	5% 10% 4 11% 8% 6% 7% 5% 9% 9% 28%	1679
	11th to 20th	Day	5% 13% 4 8% 6% 6% 6% 5% 8% 9% 32%	1665
	21st to end	Day	3 11% 5% 11% 7% 6% 8% 4 8% 9% 29%	1551
March	1st to 10th	Day	3 9% 3 8% 6% 6% 7% 6% 9% 8% 34%	3138
	11th to 20th	Day	2 7% 2 6% 5% 4 5% 5% 6% 7% 50%	3419
	21st to end	Day	7% 11% 3 8% 7% 6% 7% 6% 8% 9% 28%	4061
April	1st to 10th	Day	6% 10% 3 8% 8% 7% 8% 5% 7% 10% 29%	2280
	11th to 20th	Day	3 9% 3 7% 7% 6% 6% 5% 8% 9% 36%	2252
	21st to end	Day	4 7% 3 7% 6% 5% 7% 5% 8% 10% 39%	2512
May	1st to 10th	Day	6% 4 2 6% 5% 5% 5% 4 5% 7% 52%	4420
	11th to 20th	Day	5% 4 1 4 4 4 4 4 6% 8% 55%	4377
	21st to end	Day	7% 9% 4 9% 6% 7% 6% 5% 7% 8% 32%	4813
June	1st to 10th	Day	7% 6% 3 6% 7% 5% 6% 5% 8% 8% 40%	2660
	11th to 20th	Day	3 4 2 6% 5% 5% 6% 5% 7% 9% 47%	2607
	21st to end	Day	4 4 1 4 4 5% 4 3 6% 7% 57%	2520
July	1st to 10th	Day	2 2 1 3 3 4 5% 4 5% 6% 65%	2520
	11th to 20th	Day	3 2 1 3 3 4 3 3 5% 4 68%	2520
	21st to end	Day	1 1 1 2 3 2 2 2 3 4 79%	2741
August	1st to 10th	Day	2 2 1 3 2 3 4 3 4 6% 71%	2507
	11th to 20th	Day	2 2 1 2 2 3 3 3 5% 6% 72%	2346
	21st to end	Day	1 2 1 3 3 4 6% 4 6% 8% 63%	2398
September	1st to 10th	Day	3 2 1 4 2 3 3 4 5% 8% 66%	2160
	11th to 20th	Day	4 4 2 5% 5% 7% 5% 5% 6% 7% 52%	2160
	21st to end	Day	4 5% 2 5% 4 6% 5% 4 6% 7% 53%	1935
October	1st to 10th	Day	5% 4 2 6% 6% 5% 5% 4 7% 8% 48%	1800
	11th to 20th	Day	5% 6% 3 7% 5% 5% 6% 5% 8% 9% 43%	1800
	21st to end	Day	9% 7% 3 7% 5% 5% 6% 5% 7% 8% 38%	1804
November	1st to 10th	Day	5% 11% 4 7% 7% 8% 7% 5% 7% 8% 31%	1617
	11th to 20th	Day	3 11% 4 10% 7% 6% 6% 5% 9% 8% 30%	1520
	21st to end	Day	4 11% 4 10% 7% 6% 6% 6% 8% 9% 31%	1520
December	1st to 10th	Day	4 13% 5% 10% 6% 5% 5% 4 7% 7% 34%	1520
	11th to 20th	Day	4 12% 4 11% 7% 7% 8% 6% 8% 10% 22%	1925
	21st to end	Day	5% 14% 6% 13% 9% 7% 6% 5% 6% 6% 23%	2794
January	1st to 10th	Night	4 15% 6% 12% 8% 6% 7% 5% 7% 8% 23%	4406
	11th to 20th	Night	4 13% 8% 12% 5% 5% 5% 4 7% 10% 27%	4382
	21st to end	Night	5% 17% 7% 12% 7% 6% 6% 5% 6% 7% 20%	4862
February	1st to 10th	Night	4 11% 4 10% 7% 5% 7% 5% 7% 9% 30%	2499
	11th to 20th	Night	4 10% 3 8% 5% 5% 5% 4 8% 9% 39%	2402
	21st to end	Night	4 11% 4 10% 7% 7% 5% 5% 8% 8% 31%	1903
March	1st to 10th	Night	3 8% 3 7% 5% 5% 5% 6% 8% 11% 38%	3736
	11th to 20th	Night	2 4 2 5% 4 4 4 4 6% 8% 56%	3556
	21st to end	Night	5% 8% 3 8% 6% 6% 7% 6% 9% 10% 32%	3591
April	1st to 10th	Night	4 5% 2 7% 6% 6% 5% 6% 8% 12% 37%	1900
	11th to 20th	Night	3 6% 3 6% 5% 5% 5% 4 7% 8% 47%	1879
	21st to end	Night	4 4 2 6% 5% 5% 5% 5% 7% 9% 48%	1663
May	1st to 10th	Night	4 5% 2 5% 3 3 5% 5% 6% 7% 55%	2540
	11th to 20th	Night	4 3 1 4 3 3 4 3 5% 8% 61%	2516
	21st to end	Night	3 3 1 5% 3 4 7% 6% 9% 10% 48%	2762
June	1st to 10th	Night	5% 4 2 5% 4 4 5% 6% 7% 9% 49%	1520
	11th to 20th	Night	3 3 1 5% 5% 5% 5% 5% 7% 9% 52%	1496
	21st to end	Night	2 2 1 4 4 4 4 5% 6% 7% 63%	1440
July	1st to 10th	Night	2 1 1 3 3 3 4 4 4 7% 69%	1440
	11th to 20th	Night	1 3 2 2 3 3 4 6% 76%	1440
	21st to end	Night	1 1 2 2 2 3 5% 84%	1576
August	1st to 10th	Night	1 1 1 2 2 3 2 3 4 7% 75%	1432
	11th to 20th	Night	2 1 1 2 2 2 3 2 5% 6% 76%	1552
	21st to end	Night	2 2 2 2 3 5% 3 6% 8% 68%	1957
September	1st to 10th	Night	3 2 1 2 3 3 3 3 5% 7% 69%	1800
	11th to 20th	Night	3 3 2 5% 3 4 5% 4 5% 8% 58%	1800
	21st to end	Night	3 3 1 4 3 5% 5% 4 6% 9% 57%	2022
October	1st to 10th	Night	5% 5% 2 6% 4 4 5% 4 5% 7% 52%	2160
	11th to 20th	Night	4 5% 2 5% 5% 5% 6% 5% 7% 9% 48%	2160
	21st to end	Night	8% 7% 3 6% 5% 5% 5% 5% 6% 8% 43%	2551
November	1st to 10th	Night	8% 10% 2 7% 6% 6% 6% 5% 7% 9% 35%	2460
	11th to 20th	Night	4 9% 3 9% 6% 6% 6% 6% 7% 8% 35%	2660
	21st to end	Night	3 11% 4 10% 7% 6% 6% 6% 6% 8% 34%	2660
December	1st to 10th	Night	5% 12% 5% 9% 6% 5% 5% 5% 6% 8% 33%	2660
	11th to 20th	Night	7% 12% 5% 10% 6% 6% 8% 6% 8% 8% 24%	3280
	21st to end	Night	6% 15% 6% 14% 7% 6% 5% 4 6% 7% 23%	4862

Transparency (when cloud cover <= 30%)
Color Meanings: Too cloudy to forecast Poor Below Average Average Above average Transparent
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	55% 15% 13% 10% 6% 1	2539
	11th to 20th	Day	54% 9% 17% 16% 4	2540
	21st to end	Day	57% 12% 15% 11% 4	2794
February	1st to 10th	Day	48% 12% 17% 17% 4 1	1679
	11th to 20th	Day	43% 12% 16% 19% 9% 1	1674
	21st to end	Day	46% 12% 17% 18% 6% 1	1551
March	1st to 10th	Day	37% 11% 15% 20% 15% 2	3138
	11th to 20th	Day	30% 8% 13% 42% 7%	3419
	21st to end	Day	45% 13% 16% 18% 7%	4061
April	1st to 10th	Day	45% 9% 17% 19% 8% 1	2280
	11th to 20th	Day	38% 10% 16% 21% 12% 3	2252
	21st to end	Day	35% 10% 15% 24% 14% 2	2512
May	1st to 10th	Day	28% 7% 13% 21% 23% 8%	4420
	11th to 20th	Day	23% 5% 15% 33% 21% 2	4380
	21st to end	Day	41% 13% 14% 26% 6%	4814
June	1st to 10th	Day	36% 9% 13% 25% 15% 4	2660
	11th to 20th	Day	29% 7% 14% 30% 17% 3	2607
	21st to end	Day	22% 6% 14% 31% 23% 4	2520
July	1st to 10th	Day	17% 6% 12% 24% 29% 11%	2451
	11th to 20th	Day	16% 5% 6% 21% 33% 18%	2445
	21st to end	Day	10% 3 5% 23% 38% 21%	2589
August	1st to 10th	Day	14% 5% 9% 26% 32% 14%	2490
	11th to 20th	Day	13% 4 10% 30% 36% 8%	2346
	21st to end	Day	17% 6% 11% 31% 29% 6%	2398
September	1st to 10th	Day	16% 4 11% 31% 29% 9%	2160
	11th to 20th	Day	27% 8% 13% 23% 22% 7%	2160
	21st to end	Day	27% 8% 16% 27% 17% 4	1935
October	1st to 10th	Day	31% 7% 14% 32% 15% 2	1800
	11th to 20th	Day	33% 9% 18% 28% 12%	1800
	21st to end	Day	38% 12% 13% 23% 14% 1	1804
November	1st to 10th	Day	47% 10% 14% 18% 9% 1	1617
	11th to 20th	Day	46% 13% 18% 16% 5% 1	1520
	21st to end	Day	44% 13% 17% 16% 8% 2	1520
December	1st to 10th	Day	45% 13% 16% 18% 7%	1520
	11th to 20th	Day	51% 17% 18% 10% 4	1928
	21st to end	Day	58% 10% 11% 14% 6%	2794
January	1st to 10th	Night	55% 12% 16% 11% 6%	4406
	11th to 20th	Night	50% 9% 15% 19% 8%	4420
	21st to end	Night	59% 13% 14% 11% 3 1	4862
February	1st to 10th	Night	47% 12% 19% 18% 4 1	2499
	11th to 20th	Night	40% 11% 18% 21% 8% 1	2404
	21st to end	Night	45% 11% 15% 19% 9%	1903
March	1st to 10th	Night	33% 11% 17% 20% 14% 4	3736
	11th to 20th	Night	24% 7% 22% 39% 8%	3557
	21st to end	Night	38% 14% 20% 24% 4	3591
April	1st to 10th	Night	34% 9% 23% 23% 9% 1	1900
	11th to 20th	Night	32% 7% 20% 23% 16% 2	1879
	21st to end	Night	30% 9% 17% 29% 14% 1	1663
May	1st to 10th	Night	25% 6% 14% 26% 24% 4	2540
	11th to 20th	Night	21% 5% 14% 35% 22% 1	2516
	21st to end	Night	23% 13% 23% 32% 8% 1	2762
June	1st to 10th	Night	30% 7% 17% 27% 16% 3	1520
	11th to 20th	Night	26% 6% 18% 32% 15% 2	1496
	21st to end	Night	18% 6% 16% 37% 19% 5%	1440
July	1st to 10th	Night	14% 6% 15% 29% 24% 12%	1400
	11th to 20th	Night	10% 3 11% 28% 29% 18%	1392
	21st to end	Night	4 2 7% 26% 39% 22%	1488
August	1st to 10th	Night	10% 4 11% 28% 31% 17%	1424
	11th to 20th	Night	10% 4 13% 31% 31% 11%	1552
	21st to end	Night	13% 5% 12% 32% 30% 7%	1957
September	1st to 10th	Night	14% 4 14% 29% 30% 9%	1800
	11th to 20th	Night	24% 6% 12% 26% 24% 8%	1800
	21st to end	Night	21% 7% 17% 32% 17% 6%	2022
October	1st to 10th	Night	31% 6% 11% 32% 19% 1	2160
	11th to 20th	Night	29% 9% 17% 29% 14% 2	2160
	21st to end	Night	36% 9% 15% 26% 14%	2551
November	1st to 10th	Night	42% 10% 17% 20% 10% 1	2460
	11th to 20th	Night	41% 15% 18% 19% 6% 1	2660
	21st to end	Night	44% 12% 16% 18% 9% 1	2660
December	1st to 10th	Night	48% 11% 16% 20% 5%	2660
	11th to 20th	Night	50% 16% 19% 11% 4	3276
	21st to end	Night	55% 11% 13% 13% 7% 1	4862

Seeing (when cloud cover <= 80%)
Color Meanings: Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	12% 16% 28% 27% 14% 3	180
	11th to 20th	Day	15% 12% 31% 25% 12% 6%	180
	21st to end	Day	10% 12% 37% 27% 11% 3	198
February	1st to 10th	Day	12% 22% 37% 24% 4 1	339
	11th to 20th	Day	15% 21% 38% 18% 7%	365
	21st to end	Day	13% 21% 35% 23% 7% 1	373
March	1st to 10th	Day	13% 24% 35% 21% 6% 1	460
	11th to 20th	Day	10% 24% 32% 22% 12%	460
	21st to end	Day	15% 24% 35% 22% 4	506
April	1st to 10th	Day	17% 22% 32% 20% 7% 2	460
	11th to 20th	Day	12% 28% 33% 16% 7% 3	452
	21st to end	Day	13% 25% 30% 21% 9% 2	460
May	1st to 10th	Day	11% 16% 36% 25% 10% 1	463
	11th to 20th	Day	16% 14% 29% 26% 12% 4	488
	21st to end	Day	14% 13% 26% 26% 16% 4	529
June	1st to 10th	Day	11% 18% 31% 25% 12% 3	490
	11th to 20th	Day	11% 24% 34% 22% 9% 2	475
	21st to end	Day	5% 14% 30% 31% 16% 4	450
July	1st to 10th	Day	4 10% 27% 40% 17% 2	446
	11th to 20th	Day	3 16% 27% 34% 14% 5%	444
	21st to end	Day	2 8% 28% 40% 17% 5%	487
August	1st to 10th	Day	5% 9% 26% 36% 19% 5%	447
	11th to 20th	Day	3 8% 24% 40% 19% 7%	437
	21st to end	Day	4 12% 27% 37% 14% 6%	495
September	1st to 10th	Day	4 12% 35% 34% 12% 3	450
	11th to 20th	Day	6% 12% 32% 33% 15% 2	450
	21st to end	Day	10% 17% 31% 30% 12% 1	450
October	1st to 10th	Day	12% 12% 32% 25% 18%	450
	11th to 20th	Day	11% 16% 30% 25% 15% 3	450
	21st to end	Day	13% 18% 30% 27% 9% 3	319
November	1st to 10th	Day	13% 14% 36% 26% 9% 1	243
	11th to 20th	Day	14% 18% 29% 21% 12% 5%	180
	21st to end	Day	8% 16% 28% 30% 14% 4	180
December	1st to 10th	Day	10% 15% 30% 22% 17% 6%	180
	11th to 20th	Day	7% 14% 34% 33% 11% 1	180
	21st to end	Day	9% 12% 32% 33% 10% 3	198
January	1st to 10th	Night	12% 16% 31% 26% 14% 1	760
	11th to 20th	Night	11% 10% 32% 30% 15% 2	760
	21st to end	Night	11% 7% 29% 35% 14% 3	836
February	1st to 10th	Night	10% 11% 35% 31% 12% 1	760
	11th to 20th	Night	10% 13% 28% 33% 14% 1	744
	21st to end	Night	12% 13% 29% 31% 14% 1	628
March	1st to 10th	Night	11% 11% 31% 34% 12% 1	760
	11th to 20th	Night	5% 14% 34% 31% 15% 1	760
	21st to end	Night	9% 13% 34% 33% 9% 2	836
April	1st to 10th	Night	8% 11% 34% 32% 14% 2	760
	11th to 20th	Night	5% 15% 34% 31% 11% 2	751
	21st to end	Night	6% 11% 36% 33% 11% 2	523
May	1st to 10th	Night	6% 11% 29% 40% 13% 2	380
	11th to 20th	Night	10% 6% 23% 37% 21% 2	374
	21st to end	Night	7% 5% 27% 39% 21% 2	411
June	1st to 10th	Night	8% 6% 31% 38% 16% 2	380
	11th to 20th	Night	6% 10% 34% 36% 13%	374
	21st to end	Night	2 5% 33% 36% 23% 1	360
July	1st to 10th	Night	3 2 25% 49% 21% 1	350
	11th to 20th	Night	1 5% 31% 46% 17% 1	348
	21st to end	Night	1 4 25% 42% 26% 1	394
August	1st to 10th	Night	2 4 21% 42% 29% 2	358
	11th to 20th	Night	2 2 19% 41% 30% 6%	484
	21st to end	Night	3 7% 25% 39% 24% 3	769
September	1st to 10th	Night	3 5% 26% 36% 26% 4	720
	11th to 20th	Night	5% 5% 19% 35% 29% 8%	720
	21st to end	Night	5% 8% 26% 36% 21% 5%	720
October	1st to 10th	Night	7% 7% 26% 38% 20% 2	720
	11th to 20th	Night	6% 9% 30% 30% 21% 4	720
	21st to end	Night	11% 10% 32% 30% 12% 4	792
November	1st to 10th	Night	12% 10% 33% 35% 10% 1	740
	11th to 20th	Night	9% 13% 33% 30% 11% 3	760
	21st to end	Night	9% 11% 33% 29% 15% 3	760
December	1st to 10th	Night	10% 8% 33% 33% 14% 3	760
	11th to 20th	Night	11% 9% 35% 34% 11%	760
	21st to end	Night	9% 14% 32% 36% 8%	836

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